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on the behavior of a business process. In addition,
they propose a set of transformation rules that allow
generating a BPEL based business process from a
context sensitive business process. However, context
change patterns which regulate the context changes
are specific to their running example with no-
emphasis on proposing more generic patterns.
There are a few works using an Aspect based
adaptability in BPEL. In (Charfi and Mezini, 2007),
the authors presented an Aspect oriented extension
to BPEL: the AO4BPEL which allows dynamically
adaptable BPEL orchestration. The authors combine
business rules modeled as Aspects with a BPEL
orchestration engine. When implementing rules, the
choice of the pointcut depends only on the activities
(invoke, reply or sequence). However in our
approach the pointcut depends on the returned value
of the Context Manager Web service which detects a
context changes. Business rules in this work are very
simple and do not express a pragmatic adaptability
constraint like context change in our case. Another
work is proposed in (Erradi et al., 2005) in which the
authors propose a policy-driven adaptation and
dynamic specification of Aspects to enable instance
specific customization of the service composition.
However, they do not mention how they can present
the Aspect advices or how they will consider the
pointcuts.
6 CONCLUSIONS
In this paper, we have presented a high-level
structure called Service Domain which orchestrates
a set a of related IT services based on BPEL
specifications. The Service Domain envision
enhances the Web service concept to satisfy the
inter-enterprise collaboration requirements by hiding
complexities of managing several fine grained IT
services and also be presenting a context-aware
behaviours. However, BPEL presents limits
regarding to dynamic adaptation. To overcome this
shortage, we use Aspect Oriented Programming
principles especially crosscutting concerns and
dynamic weaving. As future work, we are working
towards completing the development of the Service
Domain architecture. An empirical study to validate
and test the proposed approach will be the driver of
future research, and interaction with industrial
partners is the key idea behind the validation of the
proposed approach.
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